I've been working on a large (1500mm x 80cm) repeat pattern for yardage screen printing. I first drew it on tracing paper with pencil, then scanned the drawings in 12 separate scans, the pieced it back together in illustrator. Once it was one compete image in Illustrator, using the pen tool I traced over the entire drawing so it is now a vector drawing. (This took ages, meaning hours and hours!, I wouldn't recommend doing this)
I'm now in the process of choosing different colour ways to print the pattern in! Exciting! It's finally taking shape.